Evaporation of flowing propane and the effect of enhanced geometry on heat transfer coefficient and pressure drop is experimentally investigated. One smooth tube and two microfinned tubes with an outer diameter of 5 mm were tested. Heat transfer coefficient and pressure drop were determined for saturation temperatures of 0, 5 and 10 °C for smooth tube, and the effect of using tubes with enhanced geometries was evaluated at heat fluxes ranging between 15 and 33 kW m⁻² and mass fluxes between 250 and 500 kW m⁻² s⁻¹. The increase of heat transfer coefficient for microfinned tubes relative to smooth tube diminishes with increasing mass flux, while the increase of pressure drop remains unaffected. Comparison of the experimental results with correlations for prediction of pressure drop and heat transfer coefficient demonstrates availability of reliable correlations. Nevertheless, correlations show considerable divergence in accuracy for different microfinned tubes.

实验研究了流动丙烷的蒸发以及几何形状的增强对传热系数和压降的影响。测试了一根光滑管和两个外径为5 mm的微翅片管。传热系数和压降确定为0,5和10℃进行平滑管，并使用具有增强的几何形状的管的效果饱和温度在热评价通量范围15和33之间千瓦米^-2之间和质量通量250和500 kW m ^-2 s ^-1。相对于光滑管，微翅片管的传热系数增加随着质量通量的增加而减小，而压降的增加却不受影响。将实验结果与用于预测压降和传热系数的相关性进行比较，证明了可靠相关性的可用性。然而，相关性显示了不同微翅片管在精度上的巨大差异。